I ran into a couple A/S 1.6 toilets from the mid 90's in the last couple weeks.
The one I saw today was a Heritage 2-piece. Parts diagram says it's # 738258-0070A
Flappers are light teal with the float. They look like the coast flappers.
The one I pulled out looked like it barely seated on the flush valve to begin with.
The Korky 1.6 flapper worked fine, but I'm curious as to what others have done/used as a generic?
I've seen the OEM flapper in the Hodes book, but $12 seems a little steep for a flapper.